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ASTROMETRIC UPDATE:
OCCULTATION BY (1236) THAIS - 2012 JAN 28

[Detailed Finder Charts]


Updated:   2012 Jan 14, 16:44 UT

Event Rank : 34

(The event Rank is a measure of the likelihood of observing an event, and is equal to the probability of at least one successful observation by a team of two observers spaced 1/8 path width just inside opposite sides of the predicted path. An event rank of 100 indicates that the prediction is expected to be very accurate).


THE UPDATED PATH

Note: The duration given in the line below is the interval during which the occultation shadow sweeps across the Earth - please see the minute markers on the map to determine the approximate time for your location.

Thais Update Map


On 2012 Jan 28 UT, the 20 km diameter asteroid (1236) Thais will occult a 8.3 mag star in the constellation Lynx for observers along a path across Queensland and Northern Territory, running from Marlborough across to Darwin.

In the case of an occultation, the combined light of the asteroid and the star will drop by 7.5 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.9 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC.

Additional details of this and other events are available at Steve Preston's website at http://www.asteroidoccultation.com/

EVENT DETAILS SUMMARY : Data for the target star : Data for the minor planet : The Occultation Path :
 Occultation of TYC 2962-01001-1 by 1236 Thais on 2012 Jan 28 
                  Centre              Star  Star   Sun      Path Limits           Error Limits
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2    Limit 3    Limit 4
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
                                                        Longitude  Longitude  Longitude  Longitude
    156  8  0   -28  0  0   15 28 28    12   329   -38  156 22  3  155 53 53  157 17 28  154 57  8
    155  0 19   -27  0  0   15 28 32    13   330   -39  155 14 31  154 46  2  156 10 31  153 48 37
    153 50 23   -26  0  0   15 28 37    14   331   -41  154  4 47  153 35 56  155  1 27  152 37 44
    152 38  2   -25  0  0   15 28 43    16   331   -42  152 52 38  152 23 21  153 50  7  151 24 14
    151 23  1   -24  0  0   15 28 49    17   332   -43  151 37 52  151  8  5  152 36 17  150  7 54

    150  5  5   -23  0  0   15 28 56    19   333   -45  150 20 13  149 49 51  151 19 43  148 48 26
    148 43 55   -22  0  0   15 29  4    20   333   -46  148 59 24  148 28 22  150  0 10  147 25 30
    147 19 11   -21  0  0   15 29 12    21   334   -48  147 35  4  147  3 14  148 37 18  145 58 41
    145 50 27   -20  0  0   15 29 22    23   335   -49  146  6 46  145 34  1  147 10 43  144 27 30
    144 17 10   -19  0  0   15 29 32    24   336   -51  144 34  2  144  0 11  145 39 59  142 51 20

    142 38 42   -18  0  0   15 29 43    26   337   -52  142 56 12  142 21  4  144  4 32  141  9 25
    140 54 13   -17  0  0   15 29 56    27   338   -53  141 12 29  140 35 47  142 23 39  139 20 45
    139  2 38   -16  0  0   15 30 10    29   339   -55  139 21 50  138 43 15  140 36 28  137 24  2
    137  2 32   -15  0  0   15 30 26    31   340   -56  137 22 54  136 41 56  138 41 48  135 17 26
    136  0  0   -14 30 36   15 30 34    31   341   -57  -14 20 53  -14 40 22  -13 42 31  -15 19 35

    135  0  0   -14  3 34   15 30 42    32   342   -57  -13 53 55  -14 13 15  -13 15 52  -14 52  8
    134  0  0   -13 37 40   15 30 51    33   343   -58  -13 28  6  -13 47 16  -12 50 20  -14 25 51
    133  0  0   -13 12 53   15 30 59    33   343   -59  -13  3 23  -13 22 25  -12 25 54  -14  0 41
    132  0  0   -12 49 12   15 31  7    34   344   -59  -12 39 46  -12 58 40  -12  2 33  -13 36 40
    131  0  0   -12 26 37   15 31 16    35   345   -59  -12 17 15  -12 36  1  -11 40 16  -13 13 45

    130  0  0   -12  5  7   15 31 25    35   346   -60  -11 55 48  -12 14 27  -11 19  4  -12 51 56
    129  0  0   -11 44 41   15 31 33    36   346   -60  -11 35 26  -11 53 58  -10 58 55  -12 31 12
    128  0  0   -11 25 19   15 31 42    36   347   -60  -11 16  7  -11 34 32  -10 39 49  -12 11 34
    127  0  0   -11  7  0   15 31 51    37   348   -61  -10 57 51  -11 16 10  -10 21 45  -11 52 59
    126  0  0   -10 49 44   15 32  0    37   349   -61  -10 40 38  -10 58 51  -10  4 42  -11 35 29

    125  0  0   -10 33 30   15 32  9    38   350   -61  -10 24 26  -10 42 35  - 9 48 41  -11 19  1
    124  0  0   -10 18 17   15 32 18    38   351   -61  -10  9 16  -10 27 20  - 9 33 41  -11  3 36
    123  0  0   -10  4  6   15 32 27    39   351   -61  - 9 55  7  -10 13  6  - 9 19 41  -10 49 13
    122  0  0   - 9 50 55   15 32 36    39   352   -61  - 9 41 59  - 9 59 54  - 9  6 40  -10 35 52
    121  0  0   - 9 38 45   15 32 45    39   353   -61  - 9 29 51  - 9 47 41  - 8 54 40  -10 23 32

    120  0  0   - 9 27 35   15 32 54    40   354   -61  - 9 18 43  - 9 36 30  - 8 43 38  -10 12 13
Uncertainty in time = +/- 4 secs

Prediction of 2012 Jan 15.0


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